How meclianical bracing 
restores strength to decayed trees 
THE intfrnal woody tissue of the tree 
has the same funetion as the bones in 
the human body— structural support. 
When this has been destroyed by decay, 
Nature is helpless to restore it and the 
tree, if neglected, will soon succumb to the 
force of the winds. And no treatment can 
permanently save it unless that treatment 
supplies scientifically the strength that 
has been lost. 
Merely to fill the cavity with cement 
will not answer. The violent swaying of 
trees by the winds makes correct mechan- 
ical bracing of decay-weakened cavities 
absolutely imperative. 
Correct mechanical bracing involves 
something more than just fixing bars and 
bolts in the cavity. 
Every tree is different, and therefore the 
bracing of each tree nui'^t differ from the 
bracing used in all other trees, at least to 
some extent. 
The tree in photograph No. 1, for ex- 
ample, required a combination of bolts and 
lock-nuts, reinforcing rods, and cross-bolts 
with lock-nuts above the crotch. 
The tree in photograph No. 2 needed a 
backbone and rib arrangement of iron 
straps, plus torsion rods and anchors. 
The tree in photograph No. 3 required 
a combination of bolts and criss-cross bolts 
with lock-nuts, torsion rods and chains. 
The tree in photograph No. 4 was so 
weak that it required a complicated and 
complete system of internal b-icing, in- 
chiding cross-bolts, criss-cross bolts, iron 
straps, anchors, torsion rods, iron backbone 
and ribs, lock-nuts, bolts above the crotch, 
plus chains and lag-hooks higher up. 
Davey Tree Surgeons are the only 
men in the world who are really 
trained for this work 
Every Davey Tree Surgeon is trained 
to the point of finished skill. He is al- 
lowed no responsibility until he has con- 
clusively demonstrated his fitness. 
Davey Tree Surgeons are the only Tree 
Surgeons officially endorsed by the United 
States Government, which engaged them 
to save the priceless trees on the Capitol 
grounds and elsewhere. 
They are the only Tree Surgeons en- 
dorsed by thousands of estate owners — ■ 
prominent men and women whose recom- 
mendations you can accept with complete 
confidence. 
And they are the only Tree Surgeons 
who are backed by asucccssful and respon- 
sible house, amply able to make good in 
every in.stanee, and not needing, for the 
sake of temporary existence, to sacrifice 
in the.slightest degree its high standard.s. 
Write today for FREE examination 
of your trees 
— and booklet. "When Your Trees Need the 
Tree Surgeon." What is the real condition of 
your trees? Only the experienced Tree .Surgeon 
can tell you fully and definitely. Without cost 
or obligation to you. a Da\-ey Tree Surgeon will 
■\-isit vour place, and render an honest verdict 
regarding their conditionand needs. Writetoday. 
The Davey Tree Expert Co., Inc. 
309 Elm Street Kent, Ohio 
(Oper.-iting tlie Davey Institute of Tree Surgery) 
Branch offices, with telephone connection: 225 Fifth Ave., 
New York; 2017 Land Title Buildinp. Philadelphia, 
450 McCormiek Buildiner. Chicago 
Permanent representatives locateil ill r.ostnn, Newport. Lenox. 
Hartfnrd, Staniforit. Albany. Poughkeepsie.W lute Plains, Jamaica, 
L. 1.; Newark. N. J.- PhilaHel- 
phia, Harrisburir. Baltimore. 
Waaliinirton, Buffalo. Pitts- 
burch, (-Cleveland, Detroit. Cin. /O* 
cinnati. Louisville. Chicago. /V> 
l-ide. OhicaKO. 
Milwaukee. Minneapolis. St, 
Louis, Kansas City. 
Canadian Address: 22 Victoria 
Sauiire. Montreal. 
Davey Tree Surgeons 
FOR 5AFETREE SURGERY 
Every real Davey Tree Su 
and the public is cuuti, 
„. . . j: in the emphy of the Davey Tree ExpertCo., 
ed against those falsdy refrtse>itiug thrmselves 
